Question

Show transcribed image textLow Battery Indicator Design. Use the ideal model of the op amp to analyze this question Assume all down arrows in the circuit schematic implies the voltage is zero at the arrow. What is the relationship between output and input voltage in the following amplifier (Vout/Vin) in terms of the resistance R? What are the absolute maximum and minimum values of the output voltage? Assume that the LED, while on, can be modeled as a 2.7V source (the turn-on voltage) in series with a 25 ohm resistor. While off, it can be modeled as an open circuit. The maximum tolerable current through the LED is 40mA. What is the maximum possible current through the LED using this circuit? Can it ever blow up? What is the approximate maximum value of the output voltage for the LED to turn on (defined as the point at which the LED just begins to conduct current)? What is the value of R such that the circuit operates as a "Battery Low" indicator for a 9V battery The "Battery Low" condition is defined as a battery voltage less than 8.2V. Use your answer to part (d) to answer this question.